revert useShallow refactor in #2701

[dai-shi]

I was rushing too much.

#2701 was to avoid react compiler warning, but it seems like the warning was caused because of destructuring ReactExports. The eslint rules aren't capable of it. Instead, let's use traditional React.useRef. This reverts #2701.

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Size Change: -203 B (-1.67%)

Total Size: 12 kB

Filename	Size	Change
./dist/esm/react.mjs	320 B	-13 B (-3.9%)
./dist/esm/react/shallow.mjs	193 B	-81 B (-29.56%)	🎉
./dist/esm/traditional.mjs	411 B	-5 B (-1.2%)
./dist/react.js	336 B	-17 B (-4.82%)	✅
./dist/react/shallow.js	208 B	-80 B (-27.78%)	🎉
./dist/traditional.js	423 B	-7 B (-1.63%)

ℹ️ View Unchanged

Filename	Size
./dist/esm/index.mjs	64 B
./dist/esm/middleware.mjs	3.56 kB
./dist/esm/middleware/immer.mjs	210 B
./dist/esm/shallow.mjs	82 B
./dist/esm/vanilla.mjs	403 B
./dist/esm/vanilla/shallow.mjs	550 B
./dist/index.js	244 B
./dist/middleware.js	3.56 kB
./dist/middleware/immer.js	229 B
./dist/shallow.js	189 B
./dist/vanilla.js	416 B
./dist/vanilla/shallow.js	562 B

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